RF
RF stands for Radio Frequency. In retail, it is commonly used as an electronic article surveillance system to help detect products leaving the store without being deactivated or removed at checkout.
Hvernig þetta virkar
The gates create a continuous signal between them. A compatible RF tag or label on the product reacts when it enters that field. The system recognises that response and triggers an alarm if the tag is still active.
Einföld leið til að mynda það
RF is a little like a radio station broadcasting all the time. The gates are always sending out a signal, and the tag responds when it passes through.